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Comments On Dec 28, 2010:I just bought a new 2010 CRF250 and I thought that I would give this a try since it decreases the size from 50mm to 46mm on the input side of the throttle body (airboot side). I am actually impressed, it gave it more down low ( the engine is a mostly a mid-top performer) and more mid with a slight loss on the top. This is by far the best bang-for-your-buck when it comes to a performance part for your 2010 (or 2011) CRF250!
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